10.8.5 will do me for now, still.
I guess the syncing feature will be useful if they implement it well (track record slightly dodgy, historically)
Streamlined Safari & Spotlight? Meh. Chromium is my choice, it's the quickest & least irritating to use for me, and spotlight is fine for indexing, but for actual searches Find Any File is much more friendly.
UI updates - fine I guess. iCloudiness? Thank you, No.
I'll be sticking with Snow Pussy for now, mostly because I have a stable system for my audio work (Mbox 2, Protools, Reason) & I can run iTunes 10.7 which, for me, is vastly less frustrating to use than the abortion that has become 11.2.